Build a medieval island town, manage resources, research technologies, trade with neighbouring rulers and defend your settlement with soldiers and villagers. Free single-player strategy in English and six other languages. AI-assisted code, text and artwork (OpenAI); sound effects and trailer music (ElevenLabs).
Choose a solo game to start; no account required. Click to choose buildings and inspect tiles, drag to pan, wheel or zoom buttons to zoom. Touch controls are available. First launch downloads offline assets and can take longer; subsequent visits reuse the cache. Progress is saved locally when browser storage is available.
Island of Prosperity was submitted to SlowDen by moravekptr. SlowDen did not make this game - it is published here from the developer's own submission, added on 2026-10-30. It runs in the browser with no download, no install and no sign-up.